Dunno ~ my late mother always reckoned that sticking out of a tongue was the last resort because the tongue outsticker had nothing worthwhile to say. On the subject I once knew a girl who, on seeing anyone stick out their tongue, would say "Yuck, you're never going to put that back in your mouth are you?". The only other observation on the subject of tongues ~ have you noticed just how many people cannot spell tongue ..... most seem to go for tounge although I have seen toungue and tonuge but I think the last must have been a typo.